Last



Oct. 26 1926. 1,604,521

. E. o. KRENTLER l LAST Original Filed April 24, 1922 K.. a 1 y CAD .Patented @et 26, 1926.

yinvitan srares rare-ngi," 'Greifen EDVJIIiT O. KRENTLER, OF DETROIT, lVCHGrVAN, ASSIGNOR TO .Klftlillfl'.ILEIB.-ARNQLD lNG-E LAST COMQANY, OF DETBOIR MCHGAN, ,A CORPOBATON OF MICHIGAN.

'LAsr n A Application filed April 24,1922, Serial No. 556,15l). Renewedseptember 1'5, 1926.

The present invention is an limproved foi-m of hinge last and is directed to improve and perfect the hinge type of last. y

'ln the manufacture of hinge lasts it is necessary andimportantto provide a last construction which will be of great strengthf and yet with as vfew parts or'meinbers and also withas little cutting-away or weakening ofthe wood partof. the lasts asis possi! ble. To this end important features of my present,.construction consist in providing a hinge last with only'three members, when considered in its simplest form, these inem-- bers consisting in. a metallic hinge member secured to the forepart, a second -metallio hinge member secured tothe heel part, and a'combined locking and unlocking memberv united and assembled with the hinge rparts on a common pivot.` Preferably I utilize a' spring in connectionwith the operation ofthe locking and unlockingmemben but such Y springis not essential, 'as will be more fully explained hereafter. t

In my Copending application, Senf No.`

553,616, filed April 17, 1922, I haveA illustrated, described Vand claimed a type `of hinge last wherein the metallic hinge members were rigidly and firmly interlocked by4 the interpositionof .a movable third or lock-A ing member andV said locking memberjwas removable by the operation of a. fourth mem;

ber, i. e., an operating'lever. In my pres? cnt invention l have greatly improved and simplifiedthe construction of this type of last, while carrying out alltheV -objects jof my invention described and claimed in said Y prior and copending case, by eliminating one of the elements above noted, and inthe present invention l have formed both the lool@` ing member and the releasing` instrumentality as a single element. j

lin the present inventionalso have coni bined the advantageous features of the well! known type of hinge lastl such as is illus# trated in Patent 1,094,153, dated April 2l',

4191i, as well, also, as Patent 1,410,477, dated' March 2l, l1922, Vhaving hereinutilized my combinedr locking, releasing and 'movable element in a construction wherein the metallic last parts are concealed and protected `and but a minimum amount of the wood of the lastand that in the "central, firm part of the wood-is cut awayto receive theV hinge members. Furthermore the j present ,tion illustrating the last knuckle joint or kant-break type'` Vof tige same or the functions or features there- .O i Y istill-f'urth'er 'feature of great impor` tance, andwhichl believe is distinctly novel the ,present invention, is that by the' einployment ofa springthe locking element'f is automatically locked during the' mere Voperation of vextending the last, and also simul hingelast without injury to the strength ofv taneously and by virtue of such springV action, any looseness or wear in .the pivot fand unlocking parts, as well as the conne'ctions between the hinge membersand the respective forepa'rt and heel part to which they are attached, is taken up, andthe lastfV is locked in as' firm `'and secure a manner and position, it is unlocked as easilyfas when the parts are all new and -in their original workingcondition.

Further features of.` the invention,` 'novel combinations vof part-s.` and advantages will be hereinafter Referring to `the drawings, f illustrating va preferred embodiment of the invention,

more fully pointed out and claimed; i l t l Fig. l is a side view partly in cross-section,

f illus tratingY my improved last inextended position;

Fig. 2 isa yview also partly in cross-sed position Fig. 3 is a fragmentary cross-sectional cation, preferably divided by a line of fout giving `the" interlocking knuckle joint `effect as shown! bvY the projecting portion 3 on thev heel part land the abutting bearing faces't and 5 to resistjstrains and stresses bottomward, the last being normally, in shoe manufacture, in upsdedown position. In the forepart l' is bored' a recess 6 toreceive aftubular member 7 ,1 the latter'V being secured'therein' by a rivet orV bolt y8.' "In the heelpartis alsofformed arecess 9 in which aplate Y-10'` is fitted and'secured'by a rivet 411'.` Ajtube Tandfplatel() overlap, the tube in flexed or broken having a slot to receive the overlapping or projecting Vportion of said plate 10, and the same are united by a pivot 12 passing through the knuckle projecting 3, and on `open at thejtop slightly, asillustrated atV 16, 16, Fig. 4l, and straddling the heel plate hinge member 10 is my vcombined locking` operating and `unlockingV device. 1 This device consists in a. metallic hinge member comprising a pair of arms or lugs Y17 17,`

suitably spaced to straddle the heel vplate 10, being unitedlat the outerv ortop portion 20 and also atl theforward part` 21. kThe latter` may be and preferablyis formed as ay block or bolt` of suitable diameter to fit slidinglythe tube' 7, and may befintegggral with the arms 17, 17, or secured theretoby i la. rivet 22. The arms 17, 17, `are preferably lformedin substantially triangular or V- shaped contour y extending downwardly` each side of the plate and about the projection 15, thus holding the locking portion 21 for-j wardly of the pivot 12, each of saidjarms 17 `having slots 2,41 through which the pivot# 12 passes.

In the the width of the arms 17 17, is concerned, when the saine is movedforwarrdly, the latter sliding on the pivot 12. v

lith the lastvconstructed as thus` yfar described, and in extended posit-ion afs-shownV in Fig. 1, a slight pressure on the handle portion 2O of the locking and unlocking device willlact to slide the same forwardly for he limit allowed by the length of the slot '.21 and the diameter of 'the pivot 12.thus

moving the interlocking portion 21 out from under engagement Awith ,the overhanging projection on the heel plate 10, ,there-v upon permitting the heel and f oreparts toV be readily flexed.` Upon repositioningy the lastin extended position, aslight movement of the locking andunlocling device or member rearwardly or to the right viewing the U figures in the drawing-servesto catch'the portion 21 under the part 15 andiloekzthe saine bearingbetween the lower part of the tube 7 and. said partl ofthemheel plate.

The lower contacting face of this project-ion` 15, where it engages'theportion 21..,inay

be and `preferably. isi slightly VVbeveled,to', permit a tightening laction, betweenthe: ,con-p tacting ,facesl in-g, the locking y action, whenV i the device is moved totherght, viewing,the S figures and therefore'into locked 'p,ositioii This permits.. compensation -OlL lwsless and weer and holds the lower faces 4 and forepart 1, Icut or form arlerf- V25 of sufficient depthand width toreceive the locking and unlocking devicesso far as,

5 always firmly in contact, irrespective of a slight looseness inthe hinge'parts or wear in the rivets lnforder to make the locking action automatic as well `as to facilitate' the action of the same, and as. well, also, as to maintain vrthe parts in hrm and rigid position, l provide a coiled spring 30, fitting within the tubular, member 7 Aand bearing between the rivet 8 and the interlocking portion 21 of thelocking and unlocking device.

his spring acts normally and constantly to force thelockingand unlocking device and particularly the portion 21 forwardly and ience when it is in engagement with theprojection 15the last will be held under a tightening tension, the space 31 being cutback considerably to allow for such continuoustension during a. considerable extent of such looseness inthe wear of the last parts.

In assembling the last they fittings are readily.l applied and connected, the tubular and j plate hinge members being` fitted and pinned vas is usual in thistype of last.- r)Thereupon the locking and interlockingy member is applied, straddling ythe hinge plate 10, the spring 30 is fitted if a spring is desired, and the parts are joined and the pivot pin 12 driven in, thereby automatically securing the `fore and heel parts together, as well as ythe, locking and interlocking member, said pin ,passing through Ithe slot 24: therein.

V The operation ofthe last will be readily understood `from the foregoing description and is` identicalwith that of my said cependling application. The last is` easily unlocked by a simple pressure on the portion 2O of the locking and unlocking device, thereby releasing the locking engagement of the poi'- tion 21 from its position, when the last is ein tended as shown in Fig. 1, and thereupon the torepart and lheel part are readily flexed yandthe last can ,be` removed from the shoe. Reverse ymovement of thehinge parts auto- `matically locks the last in ext-ended position, when a, springis employed, or if a spring is not employed, slight reverse movement of the locking and unlocking device serves to inove the portion 21 into locled engagement.. l believe that lmy present invention wherein `a last is devised and constructed by a process which permits -t-he' uniting of the `forepart, heel part, and hinge members simultaneously with the assembling vand permanentlysecuring of a lockin'g'aiid unlockw fing element is new, and I wish to claim this yprocess of manufacturejbroadly hei'eiinthis particular lfeature being common Vwith the VVlast of my present invention 'and mycopendingapplication Ser. No. 553,616, filed April 17, 1922.

Mylinvention is 'further described and defined iiifthejforinfofclaims 'as follows: 1 `fg t,'w'orpar, a,last,}having `h iiige connect` ing'mea'ns" uniting "sajd parte," "an element mounted on the hinge connecting means and movable relatively therewith and automatically movable to interlock therewith to lock the last rigidly in extended position, and to release said interlocking action at will.

2. A two-part last having hinged in'eans comprised oi' two members to imite said parts while permitting a relative pivotal movement between said parts, a combined locking and unlocking element, cooperating with said hinge means, and movable longitudinally ot said hinge means, cooperating with both said hinge members to interlock therewith and to hold the last in rigid ex` tended position, said element having a handle portion to control locking or unlocking at will.

3. A twoepart last having hinged means comprised of two members to unite said parts while permitting a relative pivotal movement between said parts, a combined locking and unlocking element, cooperating with said hinge means, and movable longi tudinally ot said hinge means, cooperating with both said hinge members to interlock therewith and to hold the last in rigid extended position, the engaging portions ot said interlocking members being constructed and arranged to compensate automatically ttor'looseness between thelast parts.

4l. A two-part last having hinged means comprised of two members to unite said parts while permitting a relative pivotal movement between 'said parts, a combined locking and unlocking element, cooperating with said hinge means, and movable longitudinally of said hinge means, cooperating with both said hinge members to interlock therewith and to hold the last in rigid extended position, the engaging portions of said interlocking members being constructed and arranged to compensate automatically for looseness between the hinge members.

5. A two-part last having hinge members uniting said parts, in combination with a locking and unlocking element movable longitudinally of said hinge members to lock or unlock the last at will.

6. A two-part last having hinge members uniting said parts, in combination with a locking and unlocking element movable longitudinally ot said hinge members to lock or unlock the last at will, said element having a handle portion to eiect the longitudinal movement.

'7. A two-part last having hinge members uniting said parts, in combination with a locking and unlocking element movable longitudinally ot said hinge members to lock or unlock the last at will, said element having a handle portion to eli'ect the longitudinal movement in one direction, and yielding means to 4actuate said element in areverse direction.

8. A two-part last, having hinge members uniting said parts to permit relative pivotal movement, a combined locking and unlocking element mounted on the pivotal connection of said members, having a portion extending on one side ot said pivot to constitute the interlocking device and a portion extending on the opposite side ot said pivot to provide an operating handle.

9. A two-part last, having hinge members uniting said parts to permit relative pivotal movement, a combined looking `and unlocking element mounted on the pivotal connection of said members, having a pois tion extending on one side ofsaid pivot to constitute the interlocking device and a portion extending on the opposite'side of said vpivot to provide an operating handle to at` tord releasing of the interlocking portion.

10; A two-part last having hinge inembers uniting said parts 'fon relative pivotal movement,`one ot' said hinge members being formed hollow, a combined locking and un-l locking element, having one portion adapt- `ed to slide within said hollow hinge member, and a handle portion to eect saidisliding action, whereby the last may be rigidly locked in extended position and said lock released betore flexing the last.

11. A two-part last having hinge mem-v' bers uniting said parts for relative pivotal movement, one of said hinge members being formed hollow, a combined locking and unlocking element, having one portion adapt- Ved to slide within said hollow hinge mem ber, and a portion guided on the other hinge member, together with a handle portion to eliect said sliding action, whereby the last may be rigidly locked in extended position and said lock released before flexing the last.

12. A two-part last having hinge inembers uniting said parts tor relative pivotal movement, one ot said hinge members being formed hollow, a combined locking and unlocking element, having one portion adapted to slide within said hollow hinge member, and a portion straddling the other hinge member, and slotted to be held in aslll) i cc

sembled position by the pivot pin uniting kname to this specication.

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